Author: Robert Hyatt
Date: 10:29:55 09/02/02
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On September 01, 2002 at 12:08:21, Uri Blass wrote: >On September 01, 2002 at 11:55:32, Vincent Diepeveen wrote: > >>On September 01, 2002 at 10:20:08, Uri Blass wrote: >> >>if you search for aske plaat you will find his stuff on >>mtd online probably. i'm amazed that you don't understand >>that Frans is using nullmove. > >I know that he is using null move but I do not use null move when I search the >line that is in the previous pv because I consider it a waste of time. > >Null move is for prunning illogical lines. > >The pv cannot be illogical line so the only case when I can save nodes by null >move pruning when I am in a pv line is when the position is zugzwang. >In other words I can save nodes only if null move pruning is wrong. Actually the PV _can_ be illogical. Remember that you are now going to go one ply deeper. That can change a lot. In Cray Blitz, and early Crafty versions, I didn't do null-move along the PV either. I do now and it is actually _faster_. You should try it, of course... > >I understood that MTD says that the pv may be wrong but the first ply of the pv >is always right so it does not make sense to prune after Nc6. mtd doesn't even mean the PV is wrong. It just means that the "old way" of getting a pv by "backing it up" has to be modified, as do lots of other things to get it right. > >Uri
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